|
Yes, dilute paints usually require more than one coat to get coverage. The naked edges is likely a case of over-thinning, as well as potentially overloading your brush. I find that if too much dilute paint goes on, it tends to "pull" itself into cracks and away from corners, whereas a more limited application stays put, even if it's too thin to cover particularly well.
As for the washes, they really don't like flat surfaces. In the best of cases, they simply leave somewhat uneven staining. If they dry irregularly, though, they can also leave "tide marks" - dark rings caused by pigment being pulled to the edges of pools that dry too quickly. You can avoid it in one of two ways: First, to limit your wash application to the immediate area (i.e. paint it in the cracks). Second, to remove excess from flats before it starts drying. You can either push the wash around with a brush dampened with water or you can use a dry brush or bit of paper towel to wick away the excess. Applying an overall wash too slowly can also have ill effects, as minor tide marks begin to appear at the edges on one side while you're applying at the other, resulting in thin, dark lines appearing in odd places.
|